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有一个列表，每个元素存放学生姓名、成绩，按学生成绩从优到差排序。

stu=['张三:20','李四:70','王五:88','李六:40','赵琦:55.5']

def sortscore(A):

    for j in range(len(A)):

        for i in range(len(A)-1):

            if A[i].split(':')[1] < A[i+1].split(':')[1]:

                A[i],A[i+1] = A[i+1],A[i]

                i=i+1

            else:

                i=i+1

        j=j+1

    return A

print(sortscore(stu))

有一个列表，每个元素存放学生姓名、成绩，计算学生的总成绩

stu=['张三:20','李四:70','王五:88','李六:40','赵琦:55.5']

def total(A):

    sum=0.0

    if len(A) == 0:

        return 0

    elif len(A) == 1:

        return float(A.split(':')[1])

    else:

        for i in range(len(A)):

            sum=sum+float(A[i].split(':')[1])

    return sum

print(total(stu))